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468 lines
14 KiB
C++
468 lines
14 KiB
C++
//===- StackMapParser.h - StackMap Parsing Support --------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_STACKMAPPARSER_H
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#define LLVM_OBJECT_STACKMAPPARSER_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/iterator_range.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Support/Endian.h"
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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namespace llvm {
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/// A parser for the latest stackmap format. At the moment, latest=V3.
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template <support::endianness Endianness>
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class StackMapParser {
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public:
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template <typename AccessorT>
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class AccessorIterator {
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public:
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AccessorIterator(AccessorT A) : A(A) {}
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AccessorIterator& operator++() { A = A.next(); return *this; }
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AccessorIterator operator++(int) {
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auto tmp = *this;
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++*this;
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return tmp;
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}
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bool operator==(const AccessorIterator &Other) const {
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return A.P == Other.A.P;
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}
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bool operator!=(const AccessorIterator &Other) const {
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return !(*this == Other);
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}
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AccessorT& operator*() { return A; }
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AccessorT* operator->() { return &A; }
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private:
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AccessorT A;
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};
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/// Accessor for function records.
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class FunctionAccessor {
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friend class StackMapParser;
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public:
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/// Get the function address.
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uint64_t getFunctionAddress() const {
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return read<uint64_t>(P);
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}
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/// Get the function's stack size.
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uint64_t getStackSize() const {
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return read<uint64_t>(P + sizeof(uint64_t));
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}
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/// Get the number of callsite records.
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uint64_t getRecordCount() const {
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return read<uint64_t>(P + (2 * sizeof(uint64_t)));
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}
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private:
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FunctionAccessor(const uint8_t *P) : P(P) {}
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const static int FunctionAccessorSize = 3 * sizeof(uint64_t);
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FunctionAccessor next() const {
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return FunctionAccessor(P + FunctionAccessorSize);
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}
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const uint8_t *P;
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};
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/// Accessor for constants.
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class ConstantAccessor {
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friend class StackMapParser;
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public:
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/// Return the value of this constant.
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uint64_t getValue() const { return read<uint64_t>(P); }
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private:
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ConstantAccessor(const uint8_t *P) : P(P) {}
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const static int ConstantAccessorSize = sizeof(uint64_t);
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ConstantAccessor next() const {
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return ConstantAccessor(P + ConstantAccessorSize);
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}
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const uint8_t *P;
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};
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enum class LocationKind : uint8_t {
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Register = 1, Direct = 2, Indirect = 3, Constant = 4, ConstantIndex = 5
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};
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/// Accessor for location records.
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class LocationAccessor {
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friend class StackMapParser;
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friend class RecordAccessor;
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public:
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/// Get the Kind for this location.
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LocationKind getKind() const {
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return LocationKind(P[KindOffset]);
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}
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/// Get the Size for this location.
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unsigned getSizeInBytes() const {
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return read<uint16_t>(P + SizeOffset);
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}
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/// Get the Dwarf register number for this location.
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uint16_t getDwarfRegNum() const {
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return read<uint16_t>(P + DwarfRegNumOffset);
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}
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/// Get the small-constant for this location. (Kind must be Constant).
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uint32_t getSmallConstant() const {
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assert(getKind() == LocationKind::Constant && "Not a small constant.");
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return read<uint32_t>(P + SmallConstantOffset);
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}
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/// Get the constant-index for this location. (Kind must be ConstantIndex).
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uint32_t getConstantIndex() const {
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assert(getKind() == LocationKind::ConstantIndex &&
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"Not a constant-index.");
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return read<uint32_t>(P + SmallConstantOffset);
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}
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/// Get the offset for this location. (Kind must be Direct or Indirect).
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int32_t getOffset() const {
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assert((getKind() == LocationKind::Direct ||
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getKind() == LocationKind::Indirect) &&
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"Not direct or indirect.");
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return read<int32_t>(P + SmallConstantOffset);
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}
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private:
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LocationAccessor(const uint8_t *P) : P(P) {}
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LocationAccessor next() const {
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return LocationAccessor(P + LocationAccessorSize);
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}
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static const int KindOffset = 0;
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static const int SizeOffset = KindOffset + sizeof(uint16_t);
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static const int DwarfRegNumOffset = SizeOffset + sizeof(uint16_t);
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static const int SmallConstantOffset = DwarfRegNumOffset + sizeof(uint32_t);
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static const int LocationAccessorSize = sizeof(uint64_t) + sizeof(uint32_t);
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const uint8_t *P;
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};
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/// Accessor for stackmap live-out fields.
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class LiveOutAccessor {
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friend class StackMapParser;
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friend class RecordAccessor;
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public:
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/// Get the Dwarf register number for this live-out.
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uint16_t getDwarfRegNum() const {
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return read<uint16_t>(P + DwarfRegNumOffset);
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}
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/// Get the size in bytes of live [sub]register.
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unsigned getSizeInBytes() const {
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return read<uint8_t>(P + SizeOffset);
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}
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private:
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LiveOutAccessor(const uint8_t *P) : P(P) {}
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LiveOutAccessor next() const {
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return LiveOutAccessor(P + LiveOutAccessorSize);
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}
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static const int DwarfRegNumOffset = 0;
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static const int SizeOffset =
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DwarfRegNumOffset + sizeof(uint16_t) + sizeof(uint8_t);
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static const int LiveOutAccessorSize = sizeof(uint32_t);
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const uint8_t *P;
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};
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/// Accessor for stackmap records.
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class RecordAccessor {
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friend class StackMapParser;
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public:
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using location_iterator = AccessorIterator<LocationAccessor>;
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using liveout_iterator = AccessorIterator<LiveOutAccessor>;
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/// Get the patchpoint/stackmap ID for this record.
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uint64_t getID() const {
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return read<uint64_t>(P + PatchpointIDOffset);
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}
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/// Get the instruction offset (from the start of the containing function)
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/// for this record.
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uint32_t getInstructionOffset() const {
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return read<uint32_t>(P + InstructionOffsetOffset);
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}
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/// Get the number of locations contained in this record.
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uint16_t getNumLocations() const {
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return read<uint16_t>(P + NumLocationsOffset);
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}
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/// Get the location with the given index.
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LocationAccessor getLocation(unsigned LocationIndex) const {
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unsigned LocationOffset =
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LocationListOffset + LocationIndex * LocationSize;
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return LocationAccessor(P + LocationOffset);
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}
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/// Begin iterator for locations.
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location_iterator location_begin() const {
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return location_iterator(getLocation(0));
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}
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/// End iterator for locations.
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location_iterator location_end() const {
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return location_iterator(getLocation(getNumLocations()));
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}
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/// Iterator range for locations.
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iterator_range<location_iterator> locations() const {
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return make_range(location_begin(), location_end());
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}
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/// Get the number of liveouts contained in this record.
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uint16_t getNumLiveOuts() const {
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return read<uint16_t>(P + getNumLiveOutsOffset());
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}
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/// Get the live-out with the given index.
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LiveOutAccessor getLiveOut(unsigned LiveOutIndex) const {
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unsigned LiveOutOffset =
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getNumLiveOutsOffset() + sizeof(uint16_t) + LiveOutIndex * LiveOutSize;
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return LiveOutAccessor(P + LiveOutOffset);
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}
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/// Begin iterator for live-outs.
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liveout_iterator liveouts_begin() const {
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return liveout_iterator(getLiveOut(0));
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}
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/// End iterator for live-outs.
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liveout_iterator liveouts_end() const {
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return liveout_iterator(getLiveOut(getNumLiveOuts()));
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}
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/// Iterator range for live-outs.
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iterator_range<liveout_iterator> liveouts() const {
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return make_range(liveouts_begin(), liveouts_end());
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}
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private:
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RecordAccessor(const uint8_t *P) : P(P) {}
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unsigned getNumLiveOutsOffset() const {
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unsigned LocOffset =
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((LocationListOffset + LocationSize * getNumLocations()) + 7) & ~0x7;
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return LocOffset + sizeof(uint16_t);
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}
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unsigned getSizeInBytes() const {
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unsigned RecordSize =
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getNumLiveOutsOffset() + sizeof(uint16_t) + getNumLiveOuts() * LiveOutSize;
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return (RecordSize + 7) & ~0x7;
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}
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RecordAccessor next() const {
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return RecordAccessor(P + getSizeInBytes());
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}
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static const unsigned PatchpointIDOffset = 0;
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static const unsigned InstructionOffsetOffset =
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PatchpointIDOffset + sizeof(uint64_t);
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static const unsigned NumLocationsOffset =
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InstructionOffsetOffset + sizeof(uint32_t) + sizeof(uint16_t);
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static const unsigned LocationListOffset =
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NumLocationsOffset + sizeof(uint16_t);
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static const unsigned LocationSize = sizeof(uint64_t) + sizeof(uint32_t);
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static const unsigned LiveOutSize = sizeof(uint32_t);
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const uint8_t *P;
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};
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/// Construct a parser for a version-3 stackmap. StackMap data will be read
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/// from the given array.
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StackMapParser(ArrayRef<uint8_t> StackMapSection)
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: StackMapSection(StackMapSection) {
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ConstantsListOffset = FunctionListOffset + getNumFunctions() * FunctionSize;
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assert(StackMapSection[0] == 3 &&
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"StackMapParser can only parse version 3 stackmaps");
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unsigned CurrentRecordOffset =
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ConstantsListOffset + getNumConstants() * ConstantSize;
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for (unsigned I = 0, E = getNumRecords(); I != E; ++I) {
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StackMapRecordOffsets.push_back(CurrentRecordOffset);
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CurrentRecordOffset +=
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RecordAccessor(&StackMapSection[CurrentRecordOffset]).getSizeInBytes();
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}
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}
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/// Validates the header of the specified stack map section.
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static Error validateHeader(ArrayRef<uint8_t> StackMapSection) {
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// See the comment for StackMaps::emitStackmapHeader().
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if (StackMapSection.size() < 16)
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return object::createError(
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"the stack map section size (" + Twine(StackMapSection.size()) +
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") is less than the minimum possible size of its header (16)");
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unsigned Version = StackMapSection[0];
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if (Version != 3)
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return object::createError(
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"the version (" + Twine(Version) +
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") of the stack map section is unsupported, the "
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"supported version is 3");
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return Error::success();
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}
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using function_iterator = AccessorIterator<FunctionAccessor>;
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using constant_iterator = AccessorIterator<ConstantAccessor>;
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using record_iterator = AccessorIterator<RecordAccessor>;
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/// Get the version number of this stackmap. (Always returns 3).
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unsigned getVersion() const { return 3; }
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/// Get the number of functions in the stack map.
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uint32_t getNumFunctions() const {
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return read<uint32_t>(&StackMapSection[NumFunctionsOffset]);
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}
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/// Get the number of large constants in the stack map.
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uint32_t getNumConstants() const {
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return read<uint32_t>(&StackMapSection[NumConstantsOffset]);
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}
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/// Get the number of stackmap records in the stackmap.
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uint32_t getNumRecords() const {
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return read<uint32_t>(&StackMapSection[NumRecordsOffset]);
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}
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/// Return an FunctionAccessor for the given function index.
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FunctionAccessor getFunction(unsigned FunctionIndex) const {
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return FunctionAccessor(StackMapSection.data() +
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getFunctionOffset(FunctionIndex));
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}
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/// Begin iterator for functions.
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function_iterator functions_begin() const {
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return function_iterator(getFunction(0));
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}
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/// End iterator for functions.
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function_iterator functions_end() const {
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return function_iterator(
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FunctionAccessor(StackMapSection.data() +
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getFunctionOffset(getNumFunctions())));
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}
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/// Iterator range for functions.
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iterator_range<function_iterator> functions() const {
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return make_range(functions_begin(), functions_end());
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}
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/// Return the large constant at the given index.
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ConstantAccessor getConstant(unsigned ConstantIndex) const {
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return ConstantAccessor(StackMapSection.data() +
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getConstantOffset(ConstantIndex));
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}
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/// Begin iterator for constants.
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constant_iterator constants_begin() const {
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return constant_iterator(getConstant(0));
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}
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/// End iterator for constants.
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constant_iterator constants_end() const {
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return constant_iterator(
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ConstantAccessor(StackMapSection.data() +
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getConstantOffset(getNumConstants())));
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}
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/// Iterator range for constants.
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iterator_range<constant_iterator> constants() const {
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return make_range(constants_begin(), constants_end());
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}
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/// Return a RecordAccessor for the given record index.
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RecordAccessor getRecord(unsigned RecordIndex) const {
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std::size_t RecordOffset = StackMapRecordOffsets[RecordIndex];
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return RecordAccessor(StackMapSection.data() + RecordOffset);
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}
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/// Begin iterator for records.
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record_iterator records_begin() const {
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if (getNumRecords() == 0)
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return record_iterator(RecordAccessor(nullptr));
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return record_iterator(getRecord(0));
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}
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/// End iterator for records.
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record_iterator records_end() const {
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// Records need to be handled specially, since we cache the start addresses
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// for them: We can't just compute the 1-past-the-end address, we have to
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// look at the last record and use the 'next' method.
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if (getNumRecords() == 0)
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return record_iterator(RecordAccessor(nullptr));
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return record_iterator(getRecord(getNumRecords() - 1).next());
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}
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/// Iterator range for records.
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iterator_range<record_iterator> records() const {
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return make_range(records_begin(), records_end());
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}
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private:
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template <typename T>
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static T read(const uint8_t *P) {
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return support::endian::read<T, Endianness, 1>(P);
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}
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static const unsigned HeaderOffset = 0;
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static const unsigned NumFunctionsOffset = HeaderOffset + sizeof(uint32_t);
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static const unsigned NumConstantsOffset = NumFunctionsOffset + sizeof(uint32_t);
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static const unsigned NumRecordsOffset = NumConstantsOffset + sizeof(uint32_t);
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static const unsigned FunctionListOffset = NumRecordsOffset + sizeof(uint32_t);
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static const unsigned FunctionSize = 3 * sizeof(uint64_t);
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static const unsigned ConstantSize = sizeof(uint64_t);
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std::size_t getFunctionOffset(unsigned FunctionIndex) const {
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return FunctionListOffset + FunctionIndex * FunctionSize;
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}
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std::size_t getConstantOffset(unsigned ConstantIndex) const {
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return ConstantsListOffset + ConstantIndex * ConstantSize;
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}
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ArrayRef<uint8_t> StackMapSection;
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unsigned ConstantsListOffset;
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std::vector<unsigned> StackMapRecordOffsets;
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};
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} // end namespace llvm
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#endif // LLVM_OBJECT_STACKMAPPARSER_H
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